No I say and you go BOO

I say "NO" and you go Boo
I am related to the anti-christ,
although my allegiance is with God.
I am the bain of your life,
The one who stops you??..
The receptionist, the secretary, the porter
The power mad, woman or man,
That's simple job (it) is to say NO.
I can hold the keys to the door you want to go through.
The one whose difficulty, really gets your Goat.
I am paid so poorly,
I need to read the rules that enable me to be a pain, the bain,
The altogether hated figure that makes your purpose
So righteous, you'll proclaim love, freedom, and respect for all.
Just because I have the gall,
To challenge your smugness as a better person.
I am the Gatekeeper, with the power I am invested with,
I say NO.
So now go away and die.
Cry to your boss or friends about how awful I am.
Sorry?..( but) it is in my job (description).